This module incorporates two buchlaidian types of voltage and audio processing.

The CD processor is designed to give Buchlidian type processing for control voltages. Two channels, both with manual +/-processing, offset & glide controls. This circuit was originally based on a Chris MacDonald design modified by Peter Grenader. Besides some minor changes i incorporated a lag pot, a trimmer for calibration of a center taped pot (+/-processing) and there's a resistor missing in the original schematic to bring the LEDs to live.

The dual low pass gate is Peter Grenaders adaptation of the classic 292C from the Electric Music Box. He substituted a DPDT ON-OFF-ON switch for the 4016 analog switch originally used.

STATUS: built

Dual CV Processor

birth of the low pass gates

Dual LP Gate

containing both the old layout and a new one, providing the additional resonance mod.

Boards before 16 JUL 09:

if you already have etched a board with resonance from the documentation before 16 JUL 09 you will have to add this little mod: just add a little jumper on the boards reverse side (missing trace shown in red).